Stone breaker and crusher



(No Model.)

P. W. GATES.

STONE BREAKER AND GRUSHER.

No. 279,147. Patented June 12,1883.

WZMW I for a tight fit between the crusher-head and A UNITED STATES PATENT I OFFICE.

PHILETUS W. GATES, OF CHICAGO, ILLINOIS.

STONEBREAKER AND CRUSHER.

SPECIFICATION forming part of Letters Patent No. 279,147, dated. June 12, 1883.

" Application filed March a1,1sss. (No model.)

To all whom it may concern:

Be it known that I, PHILErUs W. GATES, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Stone Breakers and Crushers, of which the following is a specification.

My invention relates to a new and useful means for effecting a secure attachment of crusher-heads to their shafts, the same being very similar in its purpose and obj ect-to the invention for which I applied for a patent on the 30th day of March, 1883, differing only in the construction of some of theparts whereby the object is effected. Reference is therefore made herein to the specification of said application for a fuller understanding of the special benefits derived from the general principle of my invention.

In the accompanying drawings, Figure l is a view of my invention, showing the shaft partly in elevation and partly in section, the crusher-head being shown wholly in section. Fig. 2 is a top view of the shaft and a horizontal section of the crusher-head in the line as w of Fig. 1.

A represents the shaft, and B the crusherhead. The shaft A is provided with the usual end bearings, a a, from which it increases in thickness toward the middle. About the middle of the shaft A a very slightly tapered bearing, a is provided, and nearthe end bearing, a, a similarly-tapered bearing, a of smaller diameter, is provided. Between these bearings a? a a number of concentric slightlytapered steps, a a a, of successively increased diameters, are turned on the shaft. By this described construction I avoid the great inclination of one taper between the end bearings and the consequent liability of the crush er-head to rise up on it during its operation, and at the same time I secure as many places shaft as there are steps. The bearings a a at a a are provided with a straight groove or key-seat, a, for a purpose hereinafter explained. The crusher-head B is madeof very hard metal, and is provided with end bushings, b b, of softer metalsuch as ordinary cast-iron corresponding in their bore with the shapes of the bearings a a of the shaft A, in order to secure a very tight fit. These end bushings, b b, are inserted into the mold of the crusher-head, and there surrounded by the melted metal, which, in cooling off, holds the bushings very firmly, and they may be further confined by lugs 12, formed on the bushings. The space 12 between the end bushings, b b, is of larger diameter than the shaft, around which it forms an annular chamber. Grooves b are provided between the end bushings, b b, and the space If being filled with melted zinc 0, these grooves b and the key-seat a serve as tenons or keys and prevent independent horizontal movement of either the shaft, crusher-head, or packing.

WVhen it becomes necessary to remove the crusher-head, this can be 'effected without removing the shaft with it by lifting the head upward off the shaft, and great inconvenience and labor are thus avoided.

The end bearings or bushings, b I), being harder than the zinc G, which is confined between them, serve forholding the zinc O firmly in position, thus'preventing the erushenhead from becoming loose at the ends and rising up on the shaft, as in some machines of ordinary construction.

One of the end bearings, a? a, and the corresponding bushing, b or b, may be cylindrical without changing the nature of my invention, which is to prevent (by a tight fit),the crusher-head from slipping down on the shaft A after it has been adjusted thereon for operation.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a stone breaking and crushing machine, the combination, with the shaft A, having tapered bearings for limiting downward movement, and a key-seat, of a crusher-head having soft-metal end bushings, and a packing which forms a fastening-key for preventing horizontal movement of the head inde pendently of the shaft, substantially as and for the purpose described.

2. In a stone breaking and crushing machine, the combination of a crusher-shaft, A,

having a number of very slightly tapering bearings concentrically arranged and of successively increased diameters from top to bottom, and a key-seat, a, with a crusher-head, B, having end bearings, b b, of soft metal, and suitable packing metal, 0, forming a fasten ing-key, c, substantially as and for the purpose described.

PHILETUS IV. GATES. \Vitnesses P. W. GATES, J r., ELIAS J EWELL. 

